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Some new models on Intel E3 server series network adapter goes into sleep mode on Centos 6.x when it is set to 100mbps duplex. To fix this bug their is simple addition required in /etc/grub.conf

Use nano or vi

vi /etc/grub.conf

Inside grub.conf look for line rd_NO_LVM rd_NO_DM and than add following after that;

pcie_aspm=off

Save the changes and exit. After this reboot your server and to verify the change type;

dmesg|grep PCIe

This will give following output;

PCIe ASPM is disabled